Answer:
The value is

Step-by-step explanation:
From the question we are told that
The height of the airplane is

The first charge concentration is

The height of the first charge concentration is

The second charge concentration is

The height of the second charge concentration is

The electric field due to the first charge concentration is

Here k is the Coulomb constant given in the question


The electric field due to the second charge concentration is



Generally the superposition principle can be applied in this question as follows

=>

=>
